An explicit residual based approach for shallow water flows
RICCHIUTO, Mario
Parallel tools for Numerical Algorithms and Resolution of essentially Hyperbolic problems [BACCHUS]
Institut de Mathématiques de Bordeaux [IMB]
Parallel tools for Numerical Algorithms and Resolution of essentially Hyperbolic problems [BACCHUS]
Institut de Mathématiques de Bordeaux [IMB]
RICCHIUTO, Mario
Parallel tools for Numerical Algorithms and Resolution of essentially Hyperbolic problems [BACCHUS]
Institut de Mathématiques de Bordeaux [IMB]
< Réduire
Parallel tools for Numerical Algorithms and Resolution of essentially Hyperbolic problems [BACCHUS]
Institut de Mathématiques de Bordeaux [IMB]
Langue
en
Rapport
Ce document a été publié dans
2013-08-29
Résumé
On considere un schema explicite et residual based pour la discretisation des equations shallow water sur maillages non-structures. L'approche est par construction exactement well balanced pour tous les équilibres plus ...Lire la suite >
On considere un schema explicite et residual based pour la discretisation des equations shallow water sur maillages non-structures. L'approche est par construction exactement well balanced pour tous les équilibres plus simples connus en littérature, mais il montre une super-convergence pour certains équilibres non-triviaux, comme les schemas implicites consideres en (Ricchiuto, J.Sci.Comp. 48,2011). En adaptant la strategie de wetting/drying présentée en (Ricchiuto and Bolermann, JCP 228, 2009) le schema permet en plus de garantir la non-négativite de la profondeur et de simuler runup et inondation de bathymetries complexes. La methode est analysée et testée sur un nombre important de problèmes. Les résultats montrent l'intérêt de l'approche< Réduire
Résumé en anglais
We describe a fully explicit residual based construction to discretize the shallow water equations with friction on unstructured grids. The approach is by construction exactly well balanced for al the simple known steady ...Lire la suite >
We describe a fully explicit residual based construction to discretize the shallow water equations with friction on unstructured grids. The approach is by construction exactly well balanced for al the simple known steady equilibria, and it shows a super-covergent behavior for smooth non-trivial equilibria, as the implicit residual schemes considered in (Ricchiuto, J.Sci.Comp. 48,2011). Moreover, by adapting the wetting drying technique discussed in (Ricchiuto and Bolermann, JCP 228, 2009) the scheme is able to preserve the non-negativity of the depth and to handle very well the runup and flooding of complex bathymetries. The approach is analyzed and tested thoroughly. The numerical results on a large variety of problems show the interest in the approach.< Réduire
Mots clés en anglais
ree surface flow
shallow water equations
residual approach
residual distribution
explicit scheme
rung kutta scheme
unstructured grids
second order of accuracy
C-property
generalized C-property
positivity preservation
wetting-drying
Origine
Importé de halUnités de recherche